<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        *{
          margin: 0;padding: 0;
        }
        .page{
          height: 200px;
          padding: 0 200px;
        }
        .left, .right{
          height: 200px;
          width: 200px;
          background-color: aquamarine;
        }
        .page div{
            float: left
        }
        .content{
          width: 100%;
          height: 200px;
          background-color: pink;
        }
        .left{
          position: relative;
          margin-left: -200px;
          left: -100%
        }
        .right{
          margin-left: -200px;
          position: relative;
          right:-200px;
        }
      </style>
</head>
<body>
    <div class="page">
        <div class="content">主体内容</div>
        <div class="left">广告位左</div>
        <div class="right">广告位右</div>
      </div>
    
</body>
</html>